Makita UM401DW Instruction Manual page 7

Handle adjustment (Fig. 4)
1. Turn off the interlock switch and remove the key. If
you are recharging the mower, stop recharging
and disconnect the charging plug.
2. Loosen the clamp nuts on the left and right sides.
3. Fit the protrusion of the handle into one of three
square holes according to your preference.
4. Tighten the clamp nuts firmly to secure the
handle.
CAUTION:
Always tighten the clamp nut on the left and right
sides. Failure to do so may cause the handle to come
loose unexpectedly during operation, resulting in seri-
ous injury to operator.
Wheel height adjustment (six steps between
25 mm and 89 mm) (Fig. 5)
1. Turn off the interlock switch and remove the key. If
you are recharging the mower, stop recharging
and disconnect the charging plug.
2. Push the lever outward and fit it into one of the
grooves for your desired cutting height. This one
touch wheel height adjustment system can adjust
all four wheels at the same time.
CAUTION:
Always make sure that the lever is fit in the groove
properly before operation.
Installing or removing blade
WARNING:
• Always turn off the interlock switch and remove the
key before installing or removing the blade. If you
are recharging the mower, stop recharging and
disconnect the charging plug.
• The blade coasts for several seconds after the
switch is turned off. Always remove the blade after it
has come to a complete stop.
1. Wear gloves.
2. Turn the mower on its side to expose the blade.
3. Hold the blade holder with 32 mm wrench so that
the other end of 32 mm wrench will contact the
underside of mower deck. Hold the hex bolt with
13 mm socket wrench and turn it lightly counter-
clockwise until the 32 mm wrench is firmly held by
the underside of mower deck. (Fig. 6)
4. To loosen the hex bolt, turn the 13 mm socket
wrench counterclockwise while holding down its
top. (Fig. 6)
5. Remove the hex bolt, cup spring and blade. Be
sure to remember the removal procedures.
6. To installing the blade, follow the removal proce-
dures in reverse. Be careful not to install it upside
down. When installing the blade, always make
sure that the end of blade holder fits in the cup
spring. (Fig. 7)
7. Tighten the hex bolt firmly with the wrenches
provided. To tighten it, turn the 13 mm socket
wrench clockwise while holding down its top.
When doing so, the 32 mm wrench should be
firmly held by the underside of mower deck.
(Fig. 8)
WARNING:
Replace bent or damaged blade immediately. A bent
or damaged blade may cause excessive vibration,
resulting in damage to the mower or serious injury to
operator.
Blade sharpening (Fig. 9)
Keep the blade sharp and clean for best performance.
A dull blade does not cut grass cleanly and evenly. It
may overload the motor and waste more battery
energy.
1. Turn off the interlock switch and remove the key. If
you are recharging the mower, stop recharging
and disconnect the charging plug.
2. Remove the blade as described in ''Installing or
removing blade''.
3. Secure the blade in a vice or the like.
4. Carefully sharpen the cutting edges of the blade
with a file or sharpening stone.
5. Check the balance of the blade as described in
''Blade balancing''.
6. Install the blade and secure it by tightening the
hex bolt with the wrenches provided.
CAUTION:
• Wear gloves and safety glasses during sharpening.
• Make sure the blade remains balanced.
• Sharpen the blade at the original cutting angle.
• Sharpen the cutting edges on both end of blade,
removing equal amounts of material from both
ends.
Blade Balancing (Fig. 10)
When sharpening the blade, care should be taken to
keep it balanced. An unbalance blade may cause
excessive vibration, resulting in damage to the
mower.
1. Secure a screwdriver horizontally in a vice.
2. Place the center hole in the blade on screwdriver
shank.
3. If the blade is balanced, it will remain in a horizon-
tal position.
4. If either of the blade drops downward, sharpen the
heavy side until the blade is balanced.
Emptying rear bag (Fig. 11)
1. Release the switch lever.
2. Turn off the interlock switch and remove the key.
3. Open the rear guard.
4. Hold the rear bag handle and remove the rear bag
from the mower.
5. Empty the grass from the rear bag.
WARNING:
To reduce risk of injury, inspect rear bag frequently
and replace with recommended replacement if there
are signs for wear or deterioration.
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